807
FNCA52 TJSJ 150741
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
341 AM AST WED JUL 15 2026
DISCUSSION
A DRY AIR MASS AND SAHARAN DUST WILL CONTINUE TO DOMINATE THE
REGION TODAY, KEEPING THE FIRE DANGER RISK ELEVATED. THIS DRY
WEATHER PATTERN WILL CAUSE RELATIVE HUMIDITY (RH) LEVELS TO DROP
TO CRITICAL THRESHOLD VALUES BETWEEN 40% AND THE LOW 50S DURING
THE EARLY AFTERNOON HOURS. IN ADDITION TO THE LOW HUMIDITY, WINDS
WILL BE FAVORABLE FOR RAPID FIRE SPREAD, BLOWING FROM THE EAST-
SOUTHEAST AT 10 TO 15 MPH WITH HIGHER GUSTS.
BECAUSE OF THESE CRITICAL CONDITIONS, A FIRE DANGER STATEMENT HAS
BEEN ISSUED FOR MOST SECTIONS OF THE SOUTHERN PLAINS AND ACROSS
THE NORTHERN COASTAL SECTORS OF THE ISLAND. ANY FIRES THAT IGNITE
IN THESE AREAS COULD SPREAD QUICKLY AND BECOME DIFFICULT TO
CONTROL. ADDITIONAL RED FLAG WARNING CONDITIONS ARE BRIEFLY
POSSIBLE; HOWEVER, THE LIMITING FACTOR WILL BE THE SOUTH WIND
COMPONENT THAT CAN TRIGGER CHANGES IN THE RH VALUES.
PRZ014-152115-
SOUTHEAST COASTAL PLAINS-
341 AM AST WED JUL 15 2026
TODAY TONIGHT THU
CLOUD COVER CLEAR CLEAR PCLDY
PRECIP TYPE NONE NONE SHOWERS
CHANCE PRECIP (%) 0 0 50
TEMP (24H TREND) 93 (+2) 74 (-2) 93
RH % (24H TREND) 41 (-8) 83 (+3) 45
WIND 20FT/EARLY(MPH) E 14 E 17 E 17
WIND 20FT/LATE(MPH) E 18 NE 10 E 19
MIXING HGT(FT-AGL/MSL)5330 5460
TRANSPORT WND (MPH) E 16 E 21
VENT RATE (KT-FT) 74620 98280
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ015-152115-
SOUTHERN HILLS-
341 AM AST WED JUL 15 2026
TODAY TONIGHT THU
CLOUD COVER MCLEAR CLEAR MCLEAR
PRECIP TYPE SHOWERS NONE SHOWERS
CHANCE PRECIP (%) 10 0 50
TEMP (24H TREND) 90 (+3) 70 (-3) 89
RH % (24H TREND) 53 (-8) 95 (+5) 55
WIND 20FT/EARLY(MPH) E 11 E 13 E 13
WIND 20FT/LATE(MPH) E 13 NE 11 E 14
MIXING HGT(FT-AGL/MSL)5710 5630
TRANSPORT WND (MPH) E 14 E 20
VENT RATE (KT-FT) 68520 95710
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ016-152115-
NORTH COASTAL PLAINS-
341 AM AST WED JUL 15 2026
TODAY TONIGHT THU
CLOUD COVER MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 0 30
TEMP (24H TREND) 91 (+1) 74 (-2) 91
RH % (24H TREND) 57 (-6) 95 (+4) 57
WIND 20FT/EARLY(MPH) E 13 E 19 E 16
WIND 20FT/LATE(MPH) E 20 E 13 E 21
MIXING HGT(FT-AGL/MSL)5250 4910
TRANSPORT WND (MPH) E 16 E 17
VENT RATE (KT-FT) 73500 73650
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ017-152115-
NORTHERN HILLS-
341 AM AST WED JUL 15 2026
TODAY TONIGHT THU
CLOUD COVER MCLEAR CLEAR MCLEAR
PRECIP TYPE SHOWERS NONE SHOWERS
CHANCE PRECIP (%) 20 0 40
TEMP (24H TREND) 90 (0) 71 (-2) 90
RH % (24H TREND) 58 (-4) 97 (+2) 58
WIND 20FT/EARLY(MPH) E 12 E 16 E 14
WIND 20FT/LATE(MPH) NE 17 E 11 E 19
MIXING HGT(FT-AGL/MSL)5860 5640
TRANSPORT WND (MPH) E 13 E 16
VENT RATE (KT-FT) 64460 78960
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ018-152115-
WEST COAST-
341 AM AST WED JUL 15 2026
TODAY TONIGHT THU
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS NONE TSTMS
CHANCE PRECIP (%) 60 0 50
TEMP (24H TREND) 93 (+1) 73 (-1) 93
RH % (24H TREND) 55 (-7) 97 (+5) 54
WIND 20FT/EARLY(MPH) E 12 E 13 E 13
WIND 20FT/LATE(MPH) E 13 E 13 E 16
MIXING HGT(FT-AGL/MSL)5530 5380
TRANSPORT WND (MPH) E 9 E 13
VENT RATE (KT-FT) 44240 59180
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ019-152115-
EASTERN INTERIOR-
341 AM AST WED JUL 15 2026
TODAY TONIGHT THU
CLOUD COVER MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 10 50
TEMP (24H TREND) 90 (+2) 72 (-3) 89
RH % (24H TREND) 55 (-7) 97 (+5) 58
WIND 20FT/EARLY(MPH) E 12 E 13 E 13
WIND 20FT/LATE(MPH) E 13 E 12 E 14
MIXING HGT(FT-AGL/MSL)6040 6190
TRANSPORT WND (MPH) E 14 E 18
VENT RATE (KT-FT) 72480 99040
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ022-152115-
LUQUILLO MOUNTAIN RANGE-
341 AM AST WED JUL 15 2026
TODAY TONIGHT THU
CLOUD COVER MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 20 50
TEMP (24H TREND) 84 (+3) 69 (-4) 84
RH % (24H TREND) 65 (-8) 100 (+5) 66
WIND 20FT/EARLY(MPH) E 11 E 11 E 12
WIND 20FT/LATE(MPH) E 12 E 10 E 13
MIXING HGT(FT-AGL/MSL)5120 4970
TRANSPORT WND (MPH) E 14 E 20
VENT RATE (KT-FT) 61440 84490
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ023-152115-
CENTRAL MOUNTAIN RANGE-
341 AM AST WED JUL 15 2026
TODAY TONIGHT THU
CLOUD COVER MCLEAR CLEAR PCLDY
PRECIP TYPE SHOWERS NONE TSTMS
CHANCE PRECIP (%) 50 0 50
TEMP (24H TREND) 89 (+4) 68 (-2) 88
RH % (24H TREND) 59 (-6) 98 (+3) 59
WIND 20FT/EARLY(MPH) E 9 E 10 E 10
WIND 20FT/LATE(MPH) E 11 E 10 E 11
MIXING HGT(FT-AGL/MSL)7360 6140
TRANSPORT WND (MPH) E 9 E 15
VENT RATE (KT-FT) 58880 79820
DISPERSION 5 5
DSI 6 2 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ024-152115-
CAYEY MOUNTAIN RANGE-
341 AM AST WED JUL 15 2026
TODAY TONIGHT THU
CLOUD COVER CLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 10 50
TEMP (24H TREND) 85 (+2) 70 (-2) 85
RH % (24H TREND) 62 (-6) 100 (+3) 65
WIND 20FT/EARLY(MPH) E 11 E 11 E 12
WIND 20FT/LATE(MPH) E 12 E 9 E 13
MIXING HGT(FT-AGL/MSL)5350 5610
TRANSPORT WND (MPH) E 15 E 21
VENT RATE (KT-FT) 69550 100980
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ025-152115-
VIEQUES-
341 AM AST WED JUL 15 2026
TODAY TONIGHT THU
CLOUD COVER MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 30 20 60
TEMP (24H TREND) 89 (+1) 78 (-1) 89
RH % (24H TREND) 57 (-5) 86 (+3) 58
WIND 20FT/EARLY(MPH) E 13 E 16 E 16
WIND 20FT/LATE(MPH) E 14 E 16 E 17
MIXING HGT(FT-AGL/MSL)4230 3890
TRANSPORT WND (MPH) E 17 E 20
VENT RATE (KT-FT) 63450 66130
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ026-152115-
CULEBRA-
341 AM AST WED JUL 15 2026
TODAY TONIGHT THU
CLOUD COVER MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 20 40
TEMP (24H TREND) 90 (+2) 77 (-3) 90
RH % (24H TREND) 57 (-9) 89 (+5) 59
WIND 20FT/EARLY(MPH) E 13 E 17 E 14
WIND 20FT/LATE(MPH) E 14 E 16 E 16
MIXING HGT(FT-AGL/MSL)4170 3830
TRANSPORT WND (MPH) E 17 E 20
VENT RATE (KT-FT) 62550 65110
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ027-152115-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
341 AM AST WED JUL 15 2026
TODAY TONIGHT THU
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS NONE SHOWERS
CHANCE PRECIP (%) 40 0 30
TEMP (24H TREND) 93 (+2) 74 (-2) 93
RH % (24H TREND) 43 (-9) 82 (+3) 46
WIND 20FT/EARLY(MPH) E 17 E 14 E 19
WIND 20FT/LATE(MPH) SE 19 E 12 E 21
MIXING HGT(FT-AGL/MSL)5180 5280
TRANSPORT WND (MPH) E 16 E 20
VENT RATE (KT-FT) 72520 89760
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ001-152115-
SAINT THOMAS AND SAINT JOHN-
341 AM AST WED JUL 15 2026
TODAY TONIGHT THU
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE NONE SHOWERS SHOWERS
CHANCE PRECIP (%) 0 30 20
TEMP (24H TREND) 88 (+2) 77 (-2) 88
RH % (24H TREND) 61 (-7) 89 (+5) 62
WIND 20FT/EARLY(MPH) E 14 E 17 E 16
WIND 20FT/LATE(MPH) E 13 E 17 E 16
MIXING HGT(FT-AGL/MSL)4110 3720
TRANSPORT WND (MPH) E 18 E 20
VENT RATE (KT-FT) 65760 63240
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ002-152115-
ST CROIX-
341 AM AST WED JUL 15 2026
TODAY TONIGHT THU
CLOUD COVER MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 40 40
TEMP (24H TREND) 89 (+2) 77 (-2) 89
RH % (24H TREND) 62 (-4) 87 (+2) 62
WIND 20FT/EARLY(MPH) E 14 E 16 E 17
WIND 20FT/LATE(MPH) E 13 E 16 E 17
MIXING HGT(FT-AGL/MSL)5540 4950
TRANSPORT WND (MPH) E 16 E 21
VENT RATE (KT-FT) 77560 89100
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
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